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Gas Cap - Engine Light

Dan Fahey

New member
5
0
1
Buick Ownership
2010 Buick Lucern CXL
Getting Engine light when car goes toward 1/4 full.
Fill up before that no problem.
Engine Light turns on if you do not make sure tank is full or above 1/4 mark.
Cap is new ..what are other solutions?
 

2007LucerneCXL

Full Member
2,827
847
113
Illinois
Buick Ownership
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
It's probably tossing a code which may be stored, guessing EVAP related, but a light amount of white grease on the cap / tank filler contact area sometimes resolves it. One wildcard is that the tank has some type of material in it and it's clogging the filter at 1/4 tank which will affect the fuel pump performance and could toss a code until the tank is filled, again pull a code while the CEL is on and checking the stored code(s) will offer some direction.
 

Dan Fahey

New member
5
0
1
Buick Ownership
2010 Buick Lucern CXL
It's probably tossing a code which may be stored, guessing EVAP related, but a light amount of white grease on the cap / tank filler contact area sometimes resolves it. One wildcard is that the tank has some type of material in it and it's clogging the filter at 1/4 tank which will affect the fuel pump performance and could toss a code until the tank is filled, again pull a code while the CEL is on and checking the stored code(s) will offer some direction.
Yes EVAP related
Have done the grease and reversed the rubber piece.
Cleared code same thing happens after passing 1/2 tank.
Replacing fuel filter is easy fix..
 

2007LucerneCXL

Full Member
2,827
847
113
Illinois
Buick Ownership
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
The fuel filter is built into the fuel pump system, at least on mine, so you won't find it on the frame mount like older GM's. These are a diagrams for a 07 Lucerne CXL 3.8L and the various connections if you don't have these yet.

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